Mechanical press



Aug. 7, 1928.

E. A. TERKELSEN ugc'HAN'IcAL PRESS Fired Fama, 1927 I .@T'R: QT@ 3:9, ATTURNEY- Em. 'by

Patented Aug. 7, 1928.

UNI'TIEDv STATES PATENT IOFFICE.

EDWIN A. TERKELSEN, or.BoSToN,'-MASSACHUSETTS, ASSIGNOR To lANDREW TERKELSEN, oF NEWTON, MASSACHUSETTS.

MECHANICAL PRESS.

Application filed February 7, 1927. Serial No. 166,335.

This invention relates to presses for use in the die working of, and -in analogous operations upon. materials of such a nature as to require their subjection to a constant pressure for a substantial time; during which vol umetric changes take place in the materials themselves as a result of-such pressure either with or without concurrenty heat or` other treatment. In -the co--pending application 1o of Jasper Derry, Serial No. 7,190 filedFebruary 5, 1925 a press suitable for this purpose is described in which press elements are relatively moved toward one` another to exert any desired pressureupon work interposed between them and in which a resilientfollowup pressure of likeamount is thereafter automatically applied in response to volumetric changes in the work. s

The present inventionhas 'for its chief object to provide a compact and wholly mechanical press of this type which is particularly adapted for use in heavy vwork and which may be readily and conveniently adl justed to adapt it for work ofV various vsizes and for applying Aand maintaining for a required interval any desired substantially constant pressure.

The foregoing and otherv objects of the in-A vention, together with means whereby the 3 'particular construction described and shown has been chosen for illustrative :purposesl merely and that the invention as defined by the claims hereunto appended may be otherwise embodied without departure from the scope vand spirit thereof. v

In the drawings:

Fig. 1 is afront elevational view press embodying the invention; 1

Fig. 2 ,'s a side elevational view'ofy the same; and y t Fig. 3 is a view taken along the line 3 3, Fig. 1. Y

The press, as shown. comprisesa supporting base 10 in which upright posts 11 are mounted and secured thereto by nuts 12 engaging the lower threaded portion 13 of the posts, the lower side of the base 10 being provided with supporting legs 14. The upper side of the base is provided .with upwardly projecting bosses 15 for positioning -of alatter may be carried into effect will be more relatively heavy springs 16, the upper ends of which are positioned around bosses 17 projecting downwardly from a cross-head 18 provided wit-h openingsv for the posts 11. Nuts 20 are provided on athr'eaded portion 21 ofthe posts 11 for limiting the uppermost position of the cross-head 18 which is held thereagainst by the stress of thesprings 16 which, in turn, are heldunder an initial compression thereby. n i

A lower movable press element or ram 25 is provided with openings adapted to engage posts 11 `for guiding it in its upward movement. A double toggle is provided for moving the ram 25 comprising the upper links 26 and lower links 27 ypivotally mounted upon shafts 28. The links 27 are pivotally mounted at their lower vends upon shafts 29 in lugs 30 projecting upwardly from the cross-head 18,which constitutes an abutment for the toggle, and theupper links 26 are pivotally mounted atvtheir upper ends upon the shafts 31 in lugs 32 projecting downwardlyv from the ram `25.- The shafts 28fare connected by links 33. A cam follower 34 is mounted upon one of the shafts 28' and spaced' from the otherrbyrthe links 33.

' The upper press element or bed normally is adjusted to a stationary position. In the press illustrated in the drawings, the bed 36 is provided with openingsv to receive the posts 11. A nut or collar 37 engaging theV upper threaded portion 38 ofeach post 11 hassecured thereto or formed integral there-- with a Worm. gear 39; The clamp 40`arranged to engage the top of each gear 39,` is adjustably secured tothe bed 36 by an adjusting screw 41 engaging a threaded hole 42 v i in the bed 36. The head of the adjusting screw 41 is provided withan operating handl wheel 43. means are provided forfadjusting thev nor mally Stationary press element or bed rela-v tive to all its supporting members simulf In accordance with the invention j taneously. Thus, parallel shafts 44. eachy provided with gears, such as a worm 45, engaging 'the gears 39, are held in Suitable bearings provided by brackets 46 secured to taneously and thereby adjust the position of the bed 36.

Side uprights are connected with the base 10 by an angle bar 51 which is secured upon the upriglits 50 and the base 10 by bolts 52. The uprights 50 are further reenforced by straps 53 and 511, the former being secured to the upper end of the posts 11 by bolts 55 and to the uprights 50 by bolts 56, the latter beingl secured to the uprights by bolts 57 and are provided with openings to receive the posts 11. A shelf 6() carrying a motor 6l extends between the uprights 50 and is secured to lugs 62 there- A shaft `mounted in suitable bearings in the uprights 50 is provided with a loose gear 66 meshing with a pinion 67 upon the armature shaft of the motor. Clutch mechanism generally.indicated at 68, operated from the front of the press by a rod 69 pivotally mounted in a lug 70 in the side uprights 50, is adapted to connect the gear 66 with the shaft A pinion 71 fast on the shaft 65 meshes with a gear 72 mounted upon` a shaft 73 rotatable in suitable bearings in the side uprights 50. A pinion 711 is arranged upon a shaft 73 for engagement with a vgear 75 upon a shaft 76 rotatably mounted in bearings in the uprights 50. A pinion 77 upon the shaft 76 is arranged for engagement with a gear 78 upon the main shaft 79 rotatably mounted in suitable bearings in the uprights 50. A cam 8O is mounted upon the shaft 79 so as to engage the cam follower 34- operatively connected with the toggle. The operative portion of the cam 80 comprises a relatively long and gradual rise between the points a and b, a dwell or concentric portion between the points b and c and a relatively quick fall between the points e and In operation, the cam 80 is rotated in the direction of the arrow (Fig. 2) from the motor, or other suitable source of power supply, through the gear train and operates the toggle by engagement with the follower 34C. lit is customary in presses of this type, in order to insure smooth ruiming and avoid possibility of overthrow, to straighten the toggle only approximately but not completely, the maximum force being exerted when the toggle is moved into its most nearly straightened condition. As the cam rotates in the direction indicated by the arrow in Fig. 2, the toggle is gradually straightened to move the ram 25 upwardly when the cam follower 3d engages the cam between points a and Z), and is held in such position when the follower 34 is in contact with the cam between the points o and c. The collective strength of the springs 16, as determined by their initial compression by adjustment of the nuts 20, is sufficient to enable said springs to transmit without yielding forces materially less than the pressure to be eX- erted by the press, but to cause them to yield when that pressure is approached. Vhen, therefore, the toggle is straightened, the reaction thereof against the cross-head or abutment 18 causes the'springs to yield and the cross-head to be depressed slightly out of engagement with the nuts 20. Thereafter, as the ram is held in its uppermost and a, causes the toggle to be broken and the.

ram 25 to be withdrawn. It will be understood that the weight of the ram 25 is Sullicient to maintain the follower 311 in contact with the cam 8O at all times.

The stress or initial compression of the springs 16, which controls vthe pressure the toggle exerts upon the work, may be conveniently adjusted to any predetermined desired amount by operating the press, under its own power, to lstraighten the toggle, thereby compressing the springs and disengaging the cross-head 18 from the nuts 2 0, as above explained, whereupon the press may be stopped with the' toggle in this condition and the nuts 20 adjusted without effort. Thereafter the toggle may be brokenv to relieve the pressure of the ram on the bed, and the position of the latter readjusted in accordance with the adjustmentof the nuts 2O and cross-head '18.

The position of the bed 36 maybe adjusted quickly and uniformly relative to its supporting members or posts 11 Vby turning the wheel 43 operating the screw l1 to decrease the frictional engagement of the clamp 40 with the gears 39. The gears 39 are then actuated simultaneously to*vv move the bed 36 either upwardly or downwardly depending upon the direction in which the handle 100 is turned. Vhen the bed 36 is adjusted to the desired position, the clamp l0 again is broughtinto frictional engagement with the gears 39 by turning the wheel 43 on the screw 41.

The provisions of the invention are suitably and particularlyv adapted for a press of extremely large capacity because the pressure for operating the toggle is applied at a low point upon the press and the direction of this pressure approaches a downward pressure as the tension on the springs is increased by adjustment. By such provisions th'e stability of the press is assured under all operating conditions. Furthermore it will be noted thatthe press may be adapted and readily adjusted forv the application of any desiredpressure to` the work being molded and the operative position of the press elements may be quickly and uni- Lll) formly adjusted as required by the size'v movable press elements, a resiliently sup-- ported abutment, mechanism supported upon and reactingagainst said abutmentV for raising one otsaid elements to compress material therebetween with a desired pressure, ad-v operating means for movingsaid ram to# justable means for controllingL the uppermost position ot' the abutment, vand means for operating said mechanism,'saidabut ment being adjusted upon its resilient sup-r port to move out of contact with said adjustable controlling means wliensaid mechanism is operated, whereby said abutment may rise in response -to volumetric changes in .saidA vmaterial to maintain a substantially constant pressure thereon.

2. In a press, in combination,` relatively movable press elements, a spring supported abutment, a toggle supported upon the abutment for raising one of said elements to compress material therebetween, means for operating the toggle, and means for adjusting the position of thek abutment against its spring support to limit its uppermost position, the arrangement being such that when the toggle is operated the abutment will move away from its uppermost position, whereby said spring support may operatein response to volumetric changes in said material to maintain the latter under a substantially constant pressure.

3. In a press, in combination, relatively movable press elements, an upright member for guiding said elements, a spring supported abutment guided by said member, mechanism supported upon the abutment for raising one of said elements to compress material therebetween with a desired pressure, a nut on said member above the abutment for limiting the uppermost position of the abutment, and means for operating said mechanism, the'arrangement being such that when the mechanism is operatedthe abutment will move away from its uppermost position, whereby said spring may operate in response to volumetric changes in said material to maintain the llatter under a substantially constant pressure 4. In a press, the combination with a ram and means for operating the same, of a bed and an abutment supporting said operating means and against which the latter. reacts, springs disposed beneath and supporting one of said last-named parts and acting to force the saine toward the other, adjustable means for opposing the movement of said part by f said springs whereby said springs are held under stress, and means for adjusting they position of Vthe other of saidipart-s.

' 5. In a. press, the combination with a rain and a toggle for operating the same, of a bed and an abutment supporting said toggle and againstjwhich the latterr reacts, springsdisposed beneath and supporting one of said lastnamed parts' and acting to force the same toward the other, ad'ustable means for opposing the-movement o said part by said springs whereby said springs are held under stress, and means for adjusting the position of the other of said parts- 6. In a press, in combinatioma bed,fa ram,

ward said bed, an abutment supporting said operating means and againstwhich the latter reacts, springs disposed beneath and sup-` portingfsaid abutment and acting to force the latter toward said bed, adjustable lmeans for opposing the -movementof said abutment by said springs whereby said springs are held under stress, and means for-adjusting the position of said bed. A

7. In a press, vin combination, lrelatively movable press elements, a spring supported v abutment, a toggle supported at one end upon the -abutment and connected at the other end to one of said elements and having a cam follower connected therewith, and a cam mechanism arranged to engage the follower to operate the toggle and compress material between said elements, said abutment being adjustable upon Iits spring support to maintainy saidy movable element against 'said material with la substantially constant desired pressure.

8. In a press, in combination, supporting members carrying relatively movable ress elements, mechanism for raising one o the elements to compress material therebetween,

means for operating said mechanism, a resilient member for actuating said element in response to volumetric changes in said material, and means for adjusting the other press element relative to all the supporting members simultaneously.

, 9. In a press, in combination, supporting members carrying relatively Amovable ress elements, mechanism for raising one o the elements to compress material therebetween,

means for operating said mechanism, a resilient member for actuating said element in response to volumetric changes in said material, and means foradjusting the other press element relative to all the supporting members simultaneously, and means forlocking said other element in its adjusted position.

10. In a press, in combination, a base, a plurality of supporting members secured to the base and carrying movable and normally stationary press elements, and a mechanismy for adjusting the position of the normally stationary press element relative to all the supporting members simultaneously.

11.` In a press, in combination, a plurality ofsuppoiting members, movable and norlmally stationary pressv elements carried tive to al1 the supporting memberssimultaneously, and means for locking said element in its adjusted position.

12. In a -press,'in combination, threaded upright members carrying a press element, a nut on each upright member' engaging the press element and provided with a gear, and

*means for, actuating the gears simultaneously to move'said press element.

13. In a press, in combination, threaded upright members carrying a press element, a nut on eachaupright member actuating the press element and provided with a gear, means for actuating the gears simu1taneously to move said press element, and means for locking said element in its adjusted position.

14.111 a press, inrcombination, threaded upright members carrying a press element,

a nut on each upright member engaging thel press element and provided With a gear, meansl for actuating the gears simultaneupright members carrying a press element,

a nut on each upright member engaging the press element and provided With a gear, and meansl for' actuating the gears simultaneously to move said press Velement inc1uding a shaft supported in a bearing in said:

press element.

16. In a press, in combination, upright members carrying a `press element, a nut on each upright member engaging va top portion of -the press element and provided With a gear, means for actuating the gears simultaneously -to move the pressA element, and a clamp above the press element secured thereto and adjustable to engage the top faces of said gears.

In testimony whereof I aiiix my signature.

EDNVIN A. TERKELSEN.

threaded 'i 

